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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function fn() {
            console.log("hello");
            console.log(this.name);
        }
        var o = {
            name: "d"
        };
        // 使用call调用函数
        // fn.call();
        // 改变this指向，所以在函数里的this就是o
        fn.call(o);
    </script>
</body>
</html>
</body>
</html>